Knitting-machine



No. 6I|,|30. Patented Sept. 20, I898. l. W. LAMB;

KNITTING MACHINE.

(Application filed Apr. 1, 1897.) (No Model.) R s Sheets-Sheet l.

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WITNESSES No. 6|l,|30. Patented Sept. 20, I898.

I. w. LAMB.

KNITTING MACHINE.

(Application filed Apr. 1, 1897.) (N n M 0 de l.)

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No. 6ll,l30. Patented Sept. 20, I898. l. W. LAMB.

KNITTING MACHINE.

(Application filed Apr. 1, #897.)

(No Model.)

8 Sheets-Sheet 3.

IN VENTOH A 770/?NEYS.

M: NORRIS PETERS ca, mom-1.11m. wunmn'rou. u. c.

(No Model.)

l. W. LAMB.

KNITTING MACHINE.

(Application filed Apr. 1, 1897.)

Patented Sept. 20, I898.

8 Sheets-Sheet 4.

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No. 6II,I30. Patented Sept. 20, I898.

I. W. LAMB. Y KNITTING MACHINE.

(A lication filed A r. 1 189 PP p NNNNNN I.) 8 S eeeeee Sheet 5 I St ZZZ 0 No. eluad. Patented Sept. 20, I898. I. w. LAMB.

KNITTING MACHINE.

(Application filed Apr. 1, 1897.)

(No Model.) a sheets-Sheet 6.

I 1 F p J7 ff f f5 yaw/12H I N W? N TOR No. 6||,l30. Patented Sept. 20, I898. l. W. LAMB.

KNITTING MACHINE.

Application filed Apr. 1, 1897.)

- //v VENTOP ATTORNEYS.

1 'Patented Sept. 20, I898. I. W. LAMB. KNITTING MACHINE. (Application filed Apr. 1, 1897.)

8 Sheets-Sheet 8.

(No Model.)

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ISAAC WV. LAMB, OF PERRY, MICHIGAN.

KNITTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 61 1,130, dated September 20, 1898.

To all whom it may concern:

Be it known that I, ISAAC W. LAMB, of Perry, in the county of Shiawassee and State of Michigan, have invented a new and Improved Knitting-Machine, of which the following is a full, clear, and exact description.

,, other articles and arranged in such a manner as to produce tubular fabrics or fabrics open at one end.

The invention consists principally of two rows of needles, 'a'reciprocating carriage, sets of cams on the said carriage for operating the rows of needles, and a manually-operated shifting device adapted to be set in two 'posi-' tions, one for alternately opening and closing the cams for actuating the rows of needles successively during a full stroke of the carriage to form a tubular fabric, and the other position being for opening one set of cams and closing the other set during a full stroke of the carriage and then opening the other set and closing the first set of cams during the next full stroke of the carriage to produce a fabric open at one end.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a plan view of the same. Fig. 3 is an end elevation of the same. Fig. 4. is a transverse section of the same on the line 4 4 of Fig. 1. Fig. 5 is an end elevation of the revolving frame and the mechanism for operating the same, being in an inactive position. Fig. 6 is a like view of the same with the mechanism in an active position. Fig. 7 is a plan view of the mechanism for actuating the shifting frame, part of the latter being shown in section. Fig. 8 is a plan View of the carriage, the cam-shifting device, and means for operating the same, the needle-plate-be- Application filed April 1, 1897. Serial No. 630,200. (No model.)

ing shown in outline only. Fig. 9 is a like View of the same with the cam-shifting device in a diiferent position. Fig. 10 is a diagram matic view of the line of knitting for forming a fabric open at one end. Fig. 11 is an enlarged side elevation of the cams and the bearing-plates for the same. Fig. 12 is a rear elevation of the same. Fig. 13 is a sectional plan View of the same on the line 13 13 of Fig. 11, also showing part of the carriage and the adjusting device for setting the cams according to the knitting of the loop for the fabric to be formed. Fig. 14: is an enlarged transverse section of the cams, their bearings, needle-plate, and carriage, the section being on the line 14 14: of Fig. 2. Fig. 15 is a plan view of the gib-frame for the carriageto travel on with the needle-plates in outline. Fig. 16 is an enlarged transverse section'of the carriage, the yarn-carrier, the gib-fr'ame, and needleplate, the section being on the line 16 16 of Fig. 2. Fig. 17 is an enlarged side elevation of the needle-plate. Fig. 18 is a sectional plan view ofthe same on the line 18 18 of Fig. 17, and Fig. 19 is a transverse section of the same on the line 19 19 of Fig. 17.

- The'knitting-machine is provided with a suitably-constructed main frame A, secured on a bench or other support and provided with standards A and A on the top of which is fastened the longitudinally-extending gibframe B, having two side bars B and B on which are mounted to travel the side arms 0 and 0 respectively, of the carriage 0, having its side arms connected with each otherat their ends by cross-pieces C Onthe rear or left-hand end of the carriage O is arranged a stud C pivotally connected by a pitman D with the crank-disk D, secured on the transversely-extending main driving-shaft E, connected with suitable machinery for imparting a rotary motion to the said shaft E, so that the crank-disk D and pitman D impart a reciprocating motion to the carriage O on the gib-frame B. The crank-disk Dis provided with a handle D for conveniently turning the said crank-disk by hand to permit the operator to shift the carriage 0 when starting the machine or in case of a break or the like.

On the standards A and A are secured other, as plainly illustrated in the drawings,

the said needle-plates being provided with suitable guideways for the two rows of needles G and G, respectively, to which the yarn or thread is passed from the oscillating yarncarrier H, extending between the guide-arms I and I, secured to the side arms and 0 respectively, of the carriage, as plainly illustrated in the drawings. The needles G G are actuated, as hereinafter more fully described, by the needle-actuating devices J and J, carried by the side arms Oand C respectively, of the carriage and moving with the same, each of the said devices being provided with a cam-plate J secured to the corresponding side arm of the carriage and containing the adjustable side cams K K and the middle movable cam K as shown in Figs. 11, 12, 13, and 14. These cam-plates J 2 are made about twice the usual thickness, and they have formed on their under sides guideways J J and J such guideways being about one-half an inch wide and about one-eighth of an inch deep. To each cam is secured a guide of such form as to accurately fit in these guideways on the under side of the cam -plate. The guideways thus form bearings for the guides on the cams and secure said cams accurately in their positions and yet permit of the sliding movements needed. The cams K and K are held adj ustably in angular guideways J 3 and J formed in the plate J and the cam K is fitted to slide up and down in the guideway J formed in the plate J The cam K when opened, as shown in Fig. 12, forms,with

the side cams K and K, a V- shaped groove for the passage of the projections G on the needles to shift the same in the usual manner up and down in their guideways in the needle-plates F and F, respectively. When the cam K is in an uppermost or closed position, the projections G of the needles are not affected by the cams, and consequently remain in their normal inactive position. The two cams K for the two needle-actuating devices J and J are provided at their lower ends with heads K and K respectively, extending below the under sides of the plates J (See Figs. 3 and 14.) Each head K and K has V-shaped sides K and K, and the said heads are adapted to be engaged by a shifting device adapted to be moved by the operator into either one of two positions, so that the cams are actuated in such a manner that either a tubular fabric is produced or a fabric open at one end, as hereinafter more fully described. This shifting device is provided with the V- shaped cam-stops L L, held adj ustabl y over the faces of the needle-plates F and F, respectively, and at the forward end of the machine, and the said device being also provided with two stop-pins N and N, fitted to slide up and down in guideways in the needleplates F and F at the rear end of the machine, as plainly illustrated in Figs. 2, 8, and 9. The stop L and pin N operate in conjunction with the sides K and K respectively, of the cam-head K and the stop L and the pin N operate in conjunction with the sides K and K of the head K to produce a shifting of the cams K of the two needleactuating devices J and J to produce the desired result. This method of shifting the V- cams difiers from the old method, and the result is that while in the old method the shifting was effected by an inclined slot in the cam-shifter attached to the cam-plate and the movement of the shifter was in a line parallel with the movement of the carriage and the cam-shifter came squarely against the camstop at the end of the bed of the machine and necessitated an exact adjustment of the throw of the carriage the present plan permits the carriage to pass right on any desired distance after the cams have been shifted. The old method caused a heavy blow against the cam-stops in case there was any variation in the stroke of the carriage.

The stops L L are secured to or form part of an arm L pivoted at L on the standard A of the main frame, (see Figs. 1 and 3,) and this arm L receives an intermittent rocking motion, so as to move the stops L L alternately in an upper and lowermost position, as indicated in Figs. 8 and 9. For this purpose the arm L is pivotally connected with a pitman 0, formed near its free end with a slot 0, into which projects a crank-pin 0 adapted to be locked in place on the rear end of the slot 0 by a hook 0 as shown in Figs. 6 and 7. The crank-pin O is arranged on a crank-disk O on one end of a shaft 0 journaled in suitable bearings and provided with a beveled gear-wheel O in mesh with a pinion E, secured on the main driving-shaft E. The gearing mentioned is such that the shaft E makes two revolutions to one full revo1ution of the shaft 0 so that when the crankpin 0 is locked by the hook O in the slot 0 a rocking motion from one side to the other is given to the arm L during the full revolution of the shaft Ethat is, during each full stroke of the carriage C. The stops L and L thus move alternately into an upper and lowermost position during each full stroke of the carriage.

When tubular work is knitted on the machine, the hook O is thrown out of engagement with the pin 0 (see Fig. 5) to prevent a rocking of the arm L and to hold the same in a position at one side with the stop L in a lowermost position and the stop L in an uppermost position.

The hook O is pivoted on the pitman O and when thrown down confines the movement of the crank-pin O in a small portion of the slot 0, so that the revolving crank-disk 0 brings the pin 0 alternately in contact with the end wall of the slot and the said hook to impart an intermittent rocking motion to the stoparm L it being understood that when the crank-pin 0 travels through the small portion of the slot 0 the arm L is at a standstill. When the hook O is thrown backward, as shown in Fig. 5, the wrist-pin O pulls the ICC pitman to a rearward position and then simply travels in the slot, only imparting an upand-down swinging motion to the pitman, but no movement to the stop-arm L The arm L is provided on its periphery with two notches L and L (see Figs. 5 and 6,) adapted to be alternately engaged by the curved free end of a spring L secured to the standard A the said spring serving to hold the arm in either of its two positions. The movement of the arm L is further limited by a set-screw L extending through a segmental slot L formedin the arm L the set-screw bein g attached to the standard A The pins N and N (see Fig. 4) are pressed on at their inner ends by springs N and N respectively, so as to hold the said pins normally in an innermost position-that is, with their outer ends below the top surface of the needle-plates F and F, respectively, to be completely out of the path of the cam-heads K and K In order to move the pins N and N into an outermost active position,'as shown in Fig. 4, to bring the outer ends of the pins into the path of the cam-heads K and K, I rest the inner ends of the said pins on camsurfaces N and N respectively, formed on a lever N fulcrumed at N on the standard A, the said lever being provided with a suitable handle N adapted to be taken hold of by the operator, so as to impart a swinging motion to the lever to move the cam-surfaces N and N over the inner ends of the pins to push the same into an outermost active position, as shown in Fig. 4. Now when the operator pulls the handle N forward the springs N and N force the pins N N inward, the latter traveling with their inner ends on the cam-surfaces N N into an innermost inactive position.

When it is desired to knit a tubular fabric, the stop-pins N N are moved into an outermost active position, as indicated in Fig. 4, while the arm L is held in an inactive rearward fixed position, as shown in Fig. 5, so that on reciprocating the carriage O the camhead K moves alternately in engagement with the stop L and the pin N and the head K moves alternately in engagement with the stop L and the pin N, and the head K when moving in engagement with the stop L, is pushed downwardly or outwardly, so as to move the middle cam K into an open position, as illustrated in Fig. 12, to actuate the row of needles G, and when the head K on the rear stroke of the carriage 0 moves in contact with the cam N the head is shifted upward, so as to move the cam K in a closed position to keep the row of needles G dormant during the return stroke of the carriage G from the left to the right. When the head K moves in engagement with the stop L, the cam K for the needle-actuating device J is moved into a closed position, so that on the outward stroke of the carriage from the right to the left the row of needles G remains dormant at the time the row of needles G is actuated, as above described. When the head K moves in engagement with the pin N at the time the carriage C reaches the end of its outward stroke, the said head is pushed downward to move the cam K for the needle-actuating device J into an open position, so thaton the return stroke of the carriage from the left to the right the row of needles G is actuated, while the row of needles G remains dormant, as before mentioned. Thus the rows of needles are actuated alternately on the forward and backward strokes of the carriage to produce a tubular fabric in the usual manner.

lVhen it is desired to produce a fabric open at one end, as indicated in Fig. 10, the operator shifts the lever N to permit the springs N and N to push the pins N and N into a dormant position, so as to be out of the path of the heads K and K At the same time the operator locks the crank-pin O in position on the pitman O by the hook 0 as illustrated in Fig. 6, so that the arm L is intermittently rocked transversely, as before described, to move the stops L and L alternately into an upper and lowermost position. (See Figs. Sand 9.)

When the several parts are in the position shown in Fig. 8 and the carriage 0 travels in the direction of the arrow a, then the head K on reaching the stop L is pushed into an uppermost position, so as to close the cam K for the needle-actuating device J to keep the rows of needles Gdormant during the first full stroke (forward or backward) of the carriage 0. At the same time the other head K moves in engagement with the stop L, so

as to open the cam K for the needle-actuating device J, and consequently during the now following first full stroke of the carriage O the cam K for the needle-actuating device J remains closed, while the cam K for the needle-actuating device J is open, so that the row of needles G is actuated until the return stroke of the carriage is almost completed, at which time the position of the stops L L has been changed to that shown in Fig. 9 by the act-ion of the crank-arm O and pitman on the arm L Now when the carriage C on its return stroke brings the head K in engagement with the stop L the said head is moved downward to move its cam K off the needle-actuating device J into an open position. At the same time the head K is pushed upward by coming in contact with the stop L to close the cam K of the needle-actuating device J. Now on the following second full stroke of the carriage O the row of needles G is actuated, while the row of needles G remains dormant, and consequently the fabric produced by the two strokes of the carriage is open at one end, as indicated in Fig. 10, while it is continuous at the other end. The above-described operation is then repeatedthat is, the stops L L are moved back to their former position, as shown in Fig. 8, to shift the heads K K cor- IIO respondingly to render the needles G dormant and the needles G active during the next third full stroke of the carriage.

Now it is evident that by the arrangement described a fabric may be formed which has a tubular portion and a portion open at one end with selvages at the open ends, or, if desired, a Continuous tubular fabric may be knitted or one open at one end.

Details of the preferred specific embodiments of my invention are as follows:

In order to insure a proper fastening of the gib-frame on the main frame, so as to make the gibframe independent of the needleplates and to insure a proper sliding of the carriage on the gib-frame without danger of lateral or upward movement, I prefer to form the gib-frame with the side bars B and 13", as previously described, integrally with the transversely-extending end plates Bisecured by screws or other means to the top of the standards A A suitable packings being placed between the contacting surfaces, so as to locate the gib-frame properly relative to the needle-plates F F, located directly below the said bars 13 B The bars B are formed with an upwardly-extending integral gibB, extending the entire length of the gibframe and provided with a spring Bf, fastened at its ends to the ends of the gib. (See Fig. 15.) This gib and its spring 13 fit into a correspondingly-shaped recess 0 formed on the under side of the side 0 of the carriage. (See Fig. 16.) The other side 0 of the carriage is provided on its under side with a longitudinally-extending rib C fitting against the lower edge of the side bar B of the gibframe, whereby an upward movement of the carriage, as well as a lateral movement of the same, is prevented, and the carriage, owing to the construction of the gib-frame, is always in proper relation to the gib-frame and needle-plates F F.

In the top surface of the side bar B is formed a longitudinally-extending groove B, into which fits a spring 11, provided at its middle with a projection or lug H extending through a short longitudinal slot C formed in the side 0 the said l-ug also engaging a slot H formed longitudinally in the lever H of the yarn-carrier H, the said lever II being fulcrumed at H to the side 0 of the carriage, as plainly shown in Figs. 2 and 16. Now it will be seen that when the carriage G starts on its backward or forward travel the spring II will remain stationary for a short timethat is, until the lug H is engaged and moved forward by the side 0 at the other end of the slot C so as to give a swinging motion to the said lever II by the lug H holding the arm stationary while the carriage moves.

On the upper end of the lever H is held adjustably the shank H carrying the eye H extending between the guide-plates I and I for delivering the yarn to the rows of needles G G, as previously described, to form the knit fabric. Now it is evident that the eye II in moving with the oscillating lever II always stands in proper relation to the guide-plates I I and the needles on the forward and backward motion of the carriage. The eye H located directly above the eye H is held on the usual spring-arm H secured at H to the rear end of the lever I1 and a spring II connects the lug II with the rear end of the arm, as illustrated in the drawings, forthe purpose of insuring a proper movement of the arm by the action of the spring II. The yarn passes through the usual guide H and loop II to the eye II and eye H all forming part of the yarn-carrier, to then pass to the needles.

In order to hold the cams K, K, and K in proper position on the cam-plate J and to set the said cams for moving the needles longer or shorter distances for longer or shorter loops to be formed in the fabric, I provide the detailed construction shown in Figs. 11, 12, 13, and 14. (See also Figs. 1 and 2.) The middle cam K is held in place on the plate J 2 against lateral movement by a screw K extending with its shank through an elongated slot J, formed in the plate J A spring Kiheld on the plate J presses with its free end against the head of the screw K so as to hold the cam K locked in an upper or lower position when the cam is closed or opened, as previously explained. The side cams K and K are similarly held on the plate J 2 against transverse movement by screws K and K extending through elongated inclined slots J in the plate J The heads of the screws K and K are pressed 011 by levers P and P, respectively, fulcrumed on the plate J and connected with each other at their lower ends by a spring P so as to cause the said levers to exert a downward pressure on the screws K K and the cams K K. On the screws K and K are held the arms P and 1 extending toward each other on top of the plate J and the said arm P and P are provided near their free ends with pins P and P, respectively, extending through elongated longitudinal slots 0 C", formed in the sides of the carriage C. The outer ends of the pins P and P (see Figs. 1 and 2) are engaged by the peripheral surface of the eccentrically-pivoted disks P and P, graduated in the usual manner to indicate the length of the loops to be formed on the fabric. Now it will be seen that by turning the disks P P a longitudinally-sliding motion is given to the pins P P, so as to move the cams K K correspondinglyupward or downward to increase or diminish the sliding movement of the needles according to the length of the loop desired on the fabric and as indicated by the graduation on the disks P and P Each of the needle-plates F and F (see Figs. 17, 18, and 19) is provided with a back plate F formed on its front face and near the upper end thereof with a beveled shoulder or undercut F adapted to be engaged by the upper ends of a dovetail F formed on the sections F made of sheet-steel and placed onealongside the other and shaped so as to form guideways of suitable width and depth for the needles to travel in. The lower ends of the dovetails F are engaged by the beveled shoulder or rib F of a bottom plate F extending longitudinally on the under side of the back plate F and secured thereto by screws F as plainly shown in the drawings, so as to permit of drawing the said plate F with its beveled shoulder F upward in contact with the lower ends of the dovetails F so as to securely clamp the needle-plate sections F 'in position. The end sections F are engaged by the end plates F made L- shaped and fastened by screws F and F to the back plate F so as to prevent the sections F from being displaced laterally in the dovetail groove formed by the beveled shoulders F and F. On the front faces of the end plates F are secured the attaching-plates F projecting beyond the end plates to engage and rest on the standards A and A to which the end plates are fastened by suitable screws. The top surfaces of the attaching-plates F are flush with the top surfaces of the sections F, as plainly indicated in Fig. 18, so that no projection is formed on the face of the needle-plate. Now it will be seen that by the arrangement described any section F can be readily removed and replaced by a new one, if broken or injured, by loosening the bottom plate F an amount suflicient to release the dovetailed portion of the sections and then pushing the section to be removed downward and out of the back plate. A new one is placed in position and the bottom plate F is fastened again in position to complete the needle-plate F or F. The attaching-plates F are provided with longitudinally-extending grooves F andF for the bars Q and Q, adapted to pass through corresponding apertures in the high sections F and through the needle-guideways formed by the sections to limit the movement of the needles in the needle-plates, the upper bar Q forming an abutment for the projection G of a needle and the lower bar engaging the loop thereof, as plainly indicated in Fig. 14.

In making the sections F, I make the same of two sets of different heights, of which one set of sections forms the bottoms of the needle guideways or grooves and the other the sides thereof, and the said sections can be readily sorted in pairs and placed in position to give the desired form to the groove in which the needles are to slide. In this way a degree of accuracy can be secured in the width of the needle-grooves to prevent the sticking of the needles in the plates or an uneven movement thereof.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A knitting-machine, having a plurality of rows of needles, and a carriage, and provided with a set of cam-stops, one for each row of needles, and means for moving the stops in" unison, said stops being mounted upon some stationary part independently of the carriage and being so connected that when one is in an upper position the other is in a lowerposition, and vice versa, in combination with middle cams movably mounted upon the carriage and adapted to be engaged periodically by said cam-stops, substantially as shown and described.

2. A knitting-machine, having a plurality of rows of needles, and a carriage, and provided with an oscillating arm carrying two cam-stops, one for each row of needles, means for moving the said arm, said stops being mounted upon some stationary part independently of the carriage and being so connected that when one is in the upper position the other is in the lower position, and vice versa, in combination with middle cams movably mounted upon the carriage and adapted to be periodically engaged by said cam-stops, the movement of the cam-stops being so arranged that when one stop is in the upper position, it engages the corresponding cam to push it downward,while the other stop, which is in the lower position, simultaneously en'- gages the other cam to push it upward, substantially as shown and described.

3. A knitting-machine having a plurality of rows of needles, provided with a set of camstops, one for each row of needles, means for moving the stops in unison so that one of them will be in an upper position while the other is in a lower position, and vice versa, and a detachable connecting medium between the said stops and the means for moving them,whereby the stops may be rendered inactive notwithstanding the movement of said means, substantially as described.

4. A knitting-machine provided with a reciprocating carriage carrying sets of needlecams provided with V-shaped heads, an intermittently-oscillating arm mounted upon the machine-frame independently of the carriage, cam-stops secured thereon and adapted to be engaged simultaneously by the V-shaped heads of the needle-cams to open one set and close the other and vice versa, and means for holding the arm in its resting positions, substantially as shown and described.

5. A knitting-machine provided with middle cams having diamond-shaped heads, V-

shaped cam-stops adapted to act upon both the upper and the lower edges of the said heads, an arm carrying the said stops, a pitman connected with the said arm, arevoluble crank-disk engaging with its crank-pin a slot in the said pitman and a locking-hook for connecting the said crank-pin with the pitman to intermittently move the pitman and the arm by the said crank-disk, substantially as shown and described.

6. A knitting-machine provided with a gibframe havingtwo side arms, of which one IIO is formed with a longitudinally-extending groove for receiving the friction-spring, substantially as shown and described.

7. A knitting-machine provided with a gibframe having a longitudinallyextending groove, a carriage fitted to slide thereon and formed with a longitudinally-extending slot, a spring engaging the said groove and provided with a projection extending through the said slot, and a yarn-carrier on the said carriage and engaged by the said projection to shift the position of the yarn-carrier on reciprocating the carriage, substantially as shown and described.

8. A knitting-machine provided with a carriage having cams adapted to shift the needles, and aset of cam-stops movable in unison and mounted directly on the frame of the machine so as not to move with the carriage, said cam-stops being arranged to move alternately into the upper and the lower path of the middle cams, and being so connected that when one cam-stop is in the upper position in which it shifts the corresponding cam downward, the other cam-stop is in the lower position and in readiness to shift the other cam upward, substantially as described.

9. Aknitting-machine provided with a carriage having side cams, middle cams movable on the carriage and adapted to shift the needles, projections on the said middle cams, and

' a set'of cam-stops movable in unison and mounted upon the frame independently of the carriage so as not to travel therewith, said cam-stops being arranged to move alternately into the upper and the lower path of the projections on the middle cams, and being so connected that when one cam-stop is in the upper position in which it shifts the corresponding cam downward, the other cam-stop is in the lower position and in readiness to shift the other cam upward, substantially as described.

10. A knitting-machine provided with a needle-plate comprising sections for forming the needle-guideways, and having registering dovetails, and a frame provided with a back plate formed with a beveled shoulder, a bottom plate adjustably connected with the said back plate and formed with a gib opposite the said shoulder to form with the latter a dovetail groove, for the dovetails of the said sections, end plates removably connected with the said back plate and adapted to engage the outside sections, and an attachingplate secured 011 the said end plates and projecting beyond the same, substantially as shown and described.

ISAAC W. LAMB. Witnesses:

A. W. I-IIGBIE, NORA B. WATKINS. v 

